Brake shoe of railway and the like vehicles



T. c. WAY I BRAKE SHOE OF RAILWAY AND THE LIKE VEHICLES Filed Feb. 29, 1924 INVENTO-R Tom CHERRILL WAY By his Attorneys,

Patented Oct. 19, 1926..

UNITED STATES TOM CHERRILL WAY, OF I/VIMBLEDON, LONDON, ENGLAND.

BRAKE SHOE OF RAILVTAY AND THE LIKE VEHICLES.

Application filed February 29, 1924,

This invention relates to brake shoes for use with railway and the like vehicles in which the tread of the tyres is considerably wider than the head of the rail and consequently the greatest wear of the tyre is caused at the middle part of the tread so that the tyres assume a concave contour. Owing to the slight lateral movement of the tyres on the rails a worn tyre causes the head of the rail also to wear to a curved form, the edges of the rail being frequently crushed by the concave tyre tread.

The object of this invention is to dispose the surface lengths of the different parts of a brake shoe, and consequently their durability, so as to be approximately in proportion to the amount of wear to which they are subjected by abrasion from the tyre surface with which they are brought into contact, and thereby to prevent the consequent inequality of pressure between shoe and tyre at different parts of the Width of the surfaces in contact.

It is almost invariable practice in steam and electric railway working to provide each wheel with two shoes, the shoes being usually mounted directly on the ends of the brake beams. In some cases however one shoe is provided for each wheel.

In cases in which two shoes are used according to the invention I employ two splayed shoes as described in the specification of my former United States Patent No. 1,434,46t, that is shoes in which the length of surface of the shoe in contact with the tread of the wheel is greater on one side than the other. Such shoes are of the same width as the tyre tread and are so arranged that their longest edges are on opposite sides of the tyre. In this arrangement the reatest durability of each shoe is at alternate edges of the tyre tread and the braking pressure and wear caused by both shoes at the centre of the tyre is less than when using shoes as at present constructed.

In cases where one shoe only is provided for a wheel, according to this invention the shoe is so formed that its central part is of less length than the two edges. This may be effected by cutting away a V shaped part or one at each end of a rectangular shoe. Two such shoes may be used on one wheel if desired.

In cases in which two shoes are used the amount of splay of the shoe may be greater in one case than the other so as to vary the Serial No. 695,861, and in Great Britain March 5, 1923.

amount of wear on the two edges of the tyre. Similarly in the shoe above described where one shoe is provided the length of one of the edges may be greater than the other.

The shoes described above may also be fitted with grooved parts for engaging with the flanges of the tyres, as are described in the specification of my former Patent No. 1,434,464.

The amount of splay and the amount that the sides of the V shaped parts are cut away depend on the conditions of working and cannot be stated generally but similar condi tions as set out in my former specification apply.

The accompanying drawings illustrate brake shoes made in accordance with this invention. Figure 1 is a front elevation of a wheel with the two brake shoes applied to it. Figure 2 is an elevation showing the left hand brake shoe and Figure 3 is an elevation showing the right hand brake shoe. Figure 4: is a plan of a brake shoe having a central part of less length than the two edges formed by the cut away two V shaped parts, and Figure 5 is a plan of a similar shoe in which one side of the cut away parts is longer than the other.

In Figures 1 to 3, a is the tread of the tyre and b the flange of the wheel. 0 and (Z are shoes; the longest side a of the left hand shoe 0 is on the opposite side of the tyre to the longest side (Z of the right hand shoe d.

Figure 4 shows a shoe 6 which is employed when only one shoe is provided for a wheel and which has two V shaped slots 7 and 9 formed in it so that the central part of the shoe 6 is of less length than the two edges. The shoe 7L shown in Figure 5 is similar to that shown in Figure 4 except that V shaped slots j and have one side longer than the other so that the amount of wear on the two sides of the tyre is different.

lVhat I claim is In railway and other vehicles, the combination of a tire and two splayed brake shoes of the same width as the tire tread, applied to the wheel arranged in reversed positions so that their longest edges are on the opposite sides of the tire.

In testimony that I claim the foregoing as my inveniton I have signed my name this 18th day of February, 1924.

TOM GHERRILL WAY.

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